Not everyone who posted in 2006 will respond to a PM !
You should send a note to the forum Linhof expert, Bob Salomon on this question. Having the Canham 6x17 back myself, I am guessing that it may be able to slide in when the ground glass back is pulled back all the way. Doing it this way and not using a 5x7 Graflok style back, you need 2 inches of clearance when pulling the ground glass frame away (in other words, it's like sliding a 2 inch thick film holder in front of the ground glass). It's not as nice as using Graflok sliders but it works.
https://www.canhamcameras.com/Roll%20film%20back.html
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